apprenticeship
  學徒的身分,學徒的年限
  Ap·pren·tice·ship, n.
  1. The service or condition of an apprentice; the state in which a person is gaining instruction in a trade or art, under legal agreement.
  2. The time an apprentice is serving (sometimes seven years, as from the age of fourteen to twenty-one).
  ◄ ►
  apprenticeship
       n : the position of apprentice